Visualization 1

In this video, we observe two different particles with a radius of R=1.5 micrometers. The one on the top is immersed in the chamber that has the thin a:Si:H film and the one on the bottom is in the chamber without thin film. Both particles are trapped with a power of 3 mW at a distance z=10 micrometers from the bottom, and the sample is displaced using a micrometer-step motor base. The sample on the top reaches higher velocities (around 90μm/s) than the one on the bottom (around 30 m/s), which means that the stiffness coefficient incremented its value for the sample including thermal effects.